OpenSim is an open-source software that has been extensively utilized in movement science related fields [1]}, [2]}. Despite the limitations on musculoskeletal modeling and simulations [3]}, OpenSim enables researchers to investigate human movements by providing them with biomechanical models and simulation tools [1]}, [5]}. OpenSim has been widely used to design and study assistive devices [6]}, [5]}, [8]}, [9]}, [10]}, [11]}. For instance, Uchida et al. [6]} simulated several combinations of ideal assistive devices on subjects running at 2 m/s and 5 m/s and reported that muscle activations can be decreased even in the muscles that do not cross the assisted joints, while they can be increased in some other muscles, based on the configuration of the assistive device. Their simulation results confirmed and offered clarification on some of the similar phenomena observed in experimental studies. Effects of several ideal assistive devices on the metabolic cost of subjects carrying heavy loads have been studied by Dembia et al. [5]}. Their study suggests effective joint configurations for ideal assistance and provides a perspective on how an assistive device can change the muscular activities of subjects while carrying loads.
